| | 1 | // SPDX-License-Identifier: GPL-2.0 |
| | 2 | #include <linux/err.h> |
| | 3 | #include <linux/igmp.h> |
| | 4 | #include <linux/kernel.h> |
| | 5 | #include <linux/netdevice.h> |
| | 6 | #include <linux/rculist.h> |
| | 7 | #include <linux/skbuff.h> |
| | 8 | #include <linux/if_ether.h> |
| | 9 | #include <net/ip.h> |
| | 10 | #include <net/netlink.h> |
| | 11 | #include <net/switchdev.h> |
| | 12 | #if IS_ENABLED(CONFIG_IPV6) |
| | 13 | #include <net/ipv6.h> |
| | 14 | #include <net/addrconf.h> |
| | 15 | #endif |
| | 16 | |
| | 17 | #include "br_private.h" |
| | 18 | |
| | 19 | static bool |
| | 20 | br_ip4_rports_get_timer(struct net_bridge_mcast_port *pmctx, |
| | 21 | unsigned long *timer) |
| | 22 | { |
| | 23 | *timer = br_timer_value(&pmctx->ip4_mc_router_timer); |
| | 24 | return !hlist_unhashed(&pmctx->ip4_rlist); |
| | 25 | } |
| | 26 | |
| | 27 | static bool |
| | 28 | br_ip6_rports_get_timer(struct net_bridge_mcast_port *pmctx, |
| | 29 | unsigned long *timer) |
| | 30 | { |
| | 31 | #if IS_ENABLED(CONFIG_IPV6) |
| | 32 | *timer = br_timer_value(&pmctx->ip6_mc_router_timer); |
| | 33 | return !hlist_unhashed(&pmctx->ip6_rlist); |
| | 34 | #else |
| | 35 | *timer = 0; |
| | 36 | return false; |
| | 37 | #endif |
| | 38 | } |
| | 39 | |
| | 40 | static size_t __br_rports_one_size(void) |
| | 41 | { |
| | 42 | return nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PORT */ |
| | 43 | nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_TIMER */ |
| | 44 | nla_total_size(sizeof(u8)) + /* MDBA_ROUTER_PATTR_TYPE */ |
| | 45 | nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET_TIMER */ |
| | 46 | nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET6_TIMER */ |
| | 47 | nla_total_size(sizeof(u32)); /* MDBA_ROUTER_PATTR_VID */ |
| | 48 | } |
| | 49 | |
| | 50 | size_t br_rports_size(const struct net_bridge_mcast *brmctx) |
| | 51 | { |
| | 52 | struct net_bridge_mcast_port *pmctx; |
| | 53 | size_t size = nla_total_size(0); /* MDBA_ROUTER */ |
| | 54 | |
| | 55 | rcu_read_lock(); |
| | 56 | hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list, |
| | 57 | ip4_rlist) |
| | 58 | size += __br_rports_one_size(); |
| | 59 | |
| | 60 | #if IS_ENABLED(CONFIG_IPV6) |
| | 61 | hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list, |
| | 62 | ip6_rlist) |
| | 63 | size += __br_rports_one_size(); |
| | 64 | #endif |
| | 65 | rcu_read_unlock(); |
| | 66 | |
| | 67 | return size; |
| | 68 | } |
| | 69 | |
| | 70 | int br_rports_fill_info(struct sk_buff *skb, |
| | 71 | const struct net_bridge_mcast *brmctx) |
| | 72 | { |
| | 73 | u16 vid = brmctx->vlan ? brmctx->vlan->vid : 0; |
| | 74 | bool have_ip4_mc_rtr, have_ip6_mc_rtr; |
| | 75 | unsigned long ip4_timer, ip6_timer; |
| | 76 | struct nlattr *nest, *port_nest; |
| | 77 | struct net_bridge_port *p; |
| | 78 | |
| | 79 | if (!brmctx->multicast_router || !br_rports_have_mc_router(brmctx)) |
| | 80 | return 0; |
| | 81 | |
| | 82 | nest = nla_nest_start_noflag(skb, MDBA_ROUTER); |
| | 83 | if (nest == NULL) |
| | 84 | return -EMSGSIZE; |
| | 85 | |
| | 86 | list_for_each_entry_rcu(p, &brmctx->br->port_list, list) { |
| | 87 | struct net_bridge_mcast_port *pmctx; |
| | 88 | |
| | 89 | if (vid) { |
| | 90 | struct net_bridge_vlan *v; |
| | 91 | |
| | 92 | v = br_vlan_find(nbp_vlan_group(p), vid); |
| | 93 | if (!v) |
| | 94 | continue; |
| | 95 | pmctx = &v->port_mcast_ctx; |
| | 96 | } else { |
| | 97 | pmctx = &p->multicast_ctx; |
| | 98 | } |
| | 99 | |
| | 100 | have_ip4_mc_rtr = br_ip4_rports_get_timer(pmctx, &ip4_timer); |
| | 101 | have_ip6_mc_rtr = br_ip6_rports_get_timer(pmctx, &ip6_timer); |
| | 102 | |
| | 103 | if (!have_ip4_mc_rtr && !have_ip6_mc_rtr) |
| | 104 | continue; |
| | 105 | |
| | 106 | port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT); |
| | 107 | if (!port_nest) |
| | 108 | goto fail; |
| | 109 | |
| | 110 | if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) || |
| | 111 | nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER, |
| | 112 | max(ip4_timer, ip6_timer)) || |
| | 113 | nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE, |
| | 114 | p->multicast_ctx.multicast_router) || |
| | 115 | (have_ip4_mc_rtr && |
| | 116 | nla_put_u32(skb, MDBA_ROUTER_PATTR_INET_TIMER, |
| | 117 | ip4_timer)) || |
| | 118 | (have_ip6_mc_rtr && |
| | 119 | nla_put_u32(skb, MDBA_ROUTER_PATTR_INET6_TIMER, |
| | 120 | ip6_timer)) || |
| | 121 | (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid))) { |
| | 122 | nla_nest_cancel(skb, port_nest); |
| | 123 | goto fail; |
| | 124 | } |
| | 125 | nla_nest_end(skb, port_nest); |
| | 126 | } |
| | 127 | |
| | 128 | nla_nest_end(skb, nest); |
| | 129 | return 0; |
| | 130 | fail: |
| | 131 | nla_nest_cancel(skb, nest); |
| | 132 | return -EMSGSIZE; |
| | 133 | } |
| | 134 | |
| | 135 | static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags) |
| | 136 | { |
| | 137 | e->state = flags & MDB_PG_FLAGS_PERMANENT; |
| | 138 | e->flags = 0; |
| | 139 | if (flags & MDB_PG_FLAGS_OFFLOAD) |
| | 140 | e->flags |= MDB_FLAGS_OFFLOAD; |
| | 141 | if (flags & MDB_PG_FLAGS_FAST_LEAVE) |
| | 142 | e->flags |= MDB_FLAGS_FAST_LEAVE; |
| | 143 | if (flags & MDB_PG_FLAGS_STAR_EXCL) |
| | 144 | e->flags |= MDB_FLAGS_STAR_EXCL; |
| | 145 | if (flags & MDB_PG_FLAGS_BLOCKED) |
| | 146 | e->flags |= MDB_FLAGS_BLOCKED; |
| | 147 | } |
| | 148 | |
| | 149 | static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip, |
| | 150 | struct nlattr **mdb_attrs) |
| | 151 | { |
| | 152 | memset(ip, 0, sizeof(struct br_ip)); |
| | 153 | ip->vid = entry->vid; |
| | 154 | ip->proto = entry->addr.proto; |
| | 155 | switch (ip->proto) { |
| | 156 | case htons(ETH_P_IP): |
| | 157 | ip->dst.ip4 = entry->addr.u.ip4; |
| | 158 | if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE]) |
| | 159 | ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]); |
| | 160 | break; |
| | 161 | #if IS_ENABLED(CONFIG_IPV6) |
| | 162 | case htons(ETH_P_IPV6): |
| | 163 | ip->dst.ip6 = entry->addr.u.ip6; |
| | 164 | if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE]) |
| | 165 | ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]); |
| | 166 | break; |
| | 167 | #endif |
| | 168 | default: |
| | 169 | ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr); |
| | 170 | } |
| | 171 | |
| | 172 | } |
| | 173 | |
| | 174 | static int __mdb_fill_srcs(struct sk_buff *skb, |
| | 175 | struct net_bridge_port_group *p) |
| | 176 | { |
| | 177 | struct net_bridge_group_src *ent; |
| | 178 | struct nlattr *nest, *nest_ent; |
| | 179 | |
| | 180 | if (hlist_empty(&p->src_list)) |
| | 181 | return 0; |
| | 182 | |
| | 183 | nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST); |
| | 184 | if (!nest) |
| | 185 | return -EMSGSIZE; |
| | 186 | |
| | 187 | hlist_for_each_entry_rcu(ent, &p->src_list, node, |
| | 188 | lockdep_is_held(&p->key.port->br->multicast_lock)) { |
| | 189 | nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY); |
| | 190 | if (!nest_ent) |
| | 191 | goto out_cancel_err; |
| | 192 | switch (ent->addr.proto) { |
| | 193 | case htons(ETH_P_IP): |
| | 194 | if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS, |
| | 195 | ent->addr.src.ip4)) { |
| | 196 | nla_nest_cancel(skb, nest_ent); |
| | 197 | goto out_cancel_err; |
| | 198 | } |
| | 199 | break; |
| | 200 | #if IS_ENABLED(CONFIG_IPV6) |
| | 201 | case htons(ETH_P_IPV6): |
| | 202 | if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS, |
| | 203 | &ent->addr.src.ip6)) { |
| | 204 | nla_nest_cancel(skb, nest_ent); |
| | 205 | goto out_cancel_err; |
| | 206 | } |
| | 207 | break; |
| | 208 | #endif |
| | 209 | default: |
| | 210 | nla_nest_cancel(skb, nest_ent); |
| | 211 | continue; |
| | 212 | } |
| | 213 | if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER, |
| | 214 | br_timer_value(&ent->timer))) { |
| | 215 | nla_nest_cancel(skb, nest_ent); |
| | 216 | goto out_cancel_err; |
| | 217 | } |
| | 218 | nla_nest_end(skb, nest_ent); |
| | 219 | } |
| | 220 | |
| | 221 | nla_nest_end(skb, nest); |
| | 222 | |
| | 223 | return 0; |
| | 224 | |
| | 225 | out_cancel_err: |
| | 226 | nla_nest_cancel(skb, nest); |
| | 227 | return -EMSGSIZE; |
| | 228 | } |
| | 229 | |
| | 230 | static int __mdb_fill_info(struct sk_buff *skb, |
| | 231 | struct net_bridge_mdb_entry *mp, |
| | 232 | struct net_bridge_port_group *p) |
| | 233 | { |
| | 234 | bool dump_srcs_mode = false; |
| | 235 | struct timer_list *mtimer; |
| | 236 | struct nlattr *nest_ent; |
| | 237 | struct br_mdb_entry e; |
| | 238 | u8 flags = 0; |
| | 239 | int ifindex; |
| | 240 | |
| | 241 | memset(&e, 0, sizeof(e)); |
| | 242 | if (p) { |
| | 243 | ifindex = p->key.port->dev->ifindex; |
| | 244 | mtimer = &p->timer; |
| | 245 | flags = p->flags; |
| | 246 | } else { |
| | 247 | ifindex = mp->br->dev->ifindex; |
| | 248 | mtimer = &mp->timer; |
| | 249 | } |
| | 250 | |
| | 251 | __mdb_entry_fill_flags(&e, flags); |
| | 252 | e.ifindex = ifindex; |
| | 253 | e.vid = mp->addr.vid; |
| | 254 | if (mp->addr.proto == htons(ETH_P_IP)) { |
| | 255 | e.addr.u.ip4 = mp->addr.dst.ip4; |
| | 256 | #if IS_ENABLED(CONFIG_IPV6) |
| | 257 | } else if (mp->addr.proto == htons(ETH_P_IPV6)) { |
| | 258 | e.addr.u.ip6 = mp->addr.dst.ip6; |
| | 259 | #endif |
| | 260 | } else { |
| | 261 | ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr); |
| | 262 | e.state = MDB_PG_FLAGS_PERMANENT; |
| | 263 | } |
| | 264 | e.addr.proto = mp->addr.proto; |
| | 265 | nest_ent = nla_nest_start_noflag(skb, |
| | 266 | MDBA_MDB_ENTRY_INFO); |
| | 267 | if (!nest_ent) |
| | 268 | return -EMSGSIZE; |
| | 269 | |
| | 270 | if (nla_put_nohdr(skb, sizeof(e), &e) || |
| | 271 | nla_put_u32(skb, |
| | 272 | MDBA_MDB_EATTR_TIMER, |
| | 273 | br_timer_value(mtimer))) |
| | 274 | goto nest_err; |
| | 275 | |
| | 276 | switch (mp->addr.proto) { |
| | 277 | case htons(ETH_P_IP): |
| | 278 | dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_igmp_version == 3); |
| | 279 | if (mp->addr.src.ip4) { |
| | 280 | if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE, |
| | 281 | mp->addr.src.ip4)) |
| | 282 | goto nest_err; |
| | 283 | break; |
| | 284 | } |
| | 285 | break; |
| | 286 | #if IS_ENABLED(CONFIG_IPV6) |
| | 287 | case htons(ETH_P_IPV6): |
| | 288 | dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_mld_version == 2); |
| | 289 | if (!ipv6_addr_any(&mp->addr.src.ip6)) { |
| | 290 | if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE, |
| | 291 | &mp->addr.src.ip6)) |
| | 292 | goto nest_err; |
| | 293 | break; |
| | 294 | } |
| | 295 | break; |
| | 296 | #endif |
| | 297 | default: |
| | 298 | ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr); |
| | 299 | } |
| | 300 | if (p) { |
| | 301 | if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol)) |
| | 302 | goto nest_err; |
| | 303 | if (dump_srcs_mode && |
| | 304 | (__mdb_fill_srcs(skb, p) || |
| | 305 | nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE, |
| | 306 | p->filter_mode))) |
| | 307 | goto nest_err; |
| | 308 | } |
| | 309 | nla_nest_end(skb, nest_ent); |
| | 310 | |
| | 311 | return 0; |
| | 312 | |
| | 313 | nest_err: |
| | 314 | nla_nest_cancel(skb, nest_ent); |
| | 315 | return -EMSGSIZE; |
| | 316 | } |
| | 317 | |
| | 318 | static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, |
| | 319 | struct net_device *dev) |
| | 320 | { |
| | 321 | int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2]; |
| | 322 | struct net_bridge *br = netdev_priv(dev); |
| | 323 | struct net_bridge_mdb_entry *mp; |
| | 324 | struct nlattr *nest, *nest2; |
| | 325 | |
| | 326 | if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
| | 327 | return 0; |
| | 328 | |
| | 329 | nest = nla_nest_start_noflag(skb, MDBA_MDB); |
| | 330 | if (nest == NULL) |
| | 331 | return -EMSGSIZE; |
| | 332 | |
| | 333 | hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) { |
| | 334 | struct net_bridge_port_group *p; |
| | 335 | struct net_bridge_port_group __rcu **pp; |
| | 336 | |
| | 337 | if (idx < s_idx) |
| | 338 | goto skip; |
| | 339 | |
| | 340 | nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); |
| | 341 | if (!nest2) { |
| | 342 | err = -EMSGSIZE; |
| | 343 | break; |
| | 344 | } |
| | 345 | |
| | 346 | if (!s_pidx && mp->host_joined) { |
| | 347 | err = __mdb_fill_info(skb, mp, NULL); |
| | 348 | if (err) { |
| | 349 | nla_nest_cancel(skb, nest2); |
| | 350 | break; |
| | 351 | } |
| | 352 | } |
| | 353 | |
| | 354 | for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL; |
| | 355 | pp = &p->next) { |
| | 356 | if (!p->key.port) |
| | 357 | continue; |
| | 358 | if (pidx < s_pidx) |
| | 359 | goto skip_pg; |
| | 360 | |
| | 361 | err = __mdb_fill_info(skb, mp, p); |
| | 362 | if (err) { |
| | 363 | nla_nest_end(skb, nest2); |
| | 364 | goto out; |
| | 365 | } |
| | 366 | skip_pg: |
| | 367 | pidx++; |
| | 368 | } |
| | 369 | pidx = 0; |
| | 370 | s_pidx = 0; |
| | 371 | nla_nest_end(skb, nest2); |
| | 372 | skip: |
| | 373 | idx++; |
| | 374 | } |
| | 375 | |
| | 376 | out: |
| | 377 | cb->args[1] = idx; |
| | 378 | cb->args[2] = pidx; |
| | 379 | nla_nest_end(skb, nest); |
| | 380 | return err; |
| | 381 | } |
| | 382 | |
| | 383 | static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh, |
| | 384 | struct netlink_ext_ack *extack) |
| | 385 | { |
| | 386 | struct br_port_msg *bpm; |
| | 387 | |
| | 388 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) { |
| | 389 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request"); |
| | 390 | return -EINVAL; |
| | 391 | } |
| | 392 | |
| | 393 | bpm = nlmsg_data(nlh); |
| | 394 | if (bpm->ifindex) { |
| | 395 | NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request"); |
| | 396 | return -EINVAL; |
| | 397 | } |
| | 398 | if (nlmsg_attrlen(nlh, sizeof(*bpm))) { |
| | 399 | NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request"); |
| | 400 | return -EINVAL; |
| | 401 | } |
| | 402 | |
| | 403 | return 0; |
| | 404 | } |
| | 405 | |
| | 406 | static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| | 407 | { |
| | 408 | struct net_device *dev; |
| | 409 | struct net *net = sock_net(skb->sk); |
| | 410 | struct nlmsghdr *nlh = NULL; |
| | 411 | int idx = 0, s_idx; |
| | 412 | |
| | 413 | if (cb->strict_check) { |
| | 414 | int err = br_mdb_valid_dump_req(cb->nlh, cb->extack); |
| | 415 | |
| | 416 | if (err < 0) |
| | 417 | return err; |
| | 418 | } |
| | 419 | |
| | 420 | s_idx = cb->args[0]; |
| | 421 | |
| | 422 | rcu_read_lock(); |
| | 423 | |
| | 424 | cb->seq = net->dev_base_seq; |
| | 425 | |
| | 426 | for_each_netdev_rcu(net, dev) { |
| | 427 | if (netif_is_bridge_master(dev)) { |
| | 428 | struct net_bridge *br = netdev_priv(dev); |
| | 429 | struct br_port_msg *bpm; |
| | 430 | |
| | 431 | if (idx < s_idx) |
| | 432 | goto skip; |
| | 433 | |
| | 434 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, |
| | 435 | cb->nlh->nlmsg_seq, RTM_GETMDB, |
| | 436 | sizeof(*bpm), NLM_F_MULTI); |
| | 437 | if (nlh == NULL) |
| | 438 | break; |
| | 439 | |
| | 440 | bpm = nlmsg_data(nlh); |
| | 441 | memset(bpm, 0, sizeof(*bpm)); |
| | 442 | bpm->ifindex = dev->ifindex; |
| | 443 | if (br_mdb_fill_info(skb, cb, dev) < 0) |
| | 444 | goto out; |
| | 445 | if (br_rports_fill_info(skb, &br->multicast_ctx) < 0) |
| | 446 | goto out; |
| | 447 | |
| | 448 | cb->args[1] = 0; |
| | 449 | nlmsg_end(skb, nlh); |
| | 450 | skip: |
| | 451 | idx++; |
| | 452 | } |
| | 453 | } |
| | 454 | |
| | 455 | out: |
| | 456 | if (nlh) |
| | 457 | nlmsg_end(skb, nlh); |
| | 458 | rcu_read_unlock(); |
| | 459 | cb->args[0] = idx; |
| | 460 | return skb->len; |
| | 461 | } |
| | 462 | |
| | 463 | static int nlmsg_populate_mdb_fill(struct sk_buff *skb, |
| | 464 | struct net_device *dev, |
| | 465 | struct net_bridge_mdb_entry *mp, |
| | 466 | struct net_bridge_port_group *pg, |
| | 467 | int type) |
| | 468 | { |
| | 469 | struct nlmsghdr *nlh; |
| | 470 | struct br_port_msg *bpm; |
| | 471 | struct nlattr *nest, *nest2; |
| | 472 | |
| | 473 | nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0); |
| | 474 | if (!nlh) |
| | 475 | return -EMSGSIZE; |
| | 476 | |
| | 477 | bpm = nlmsg_data(nlh); |
| | 478 | memset(bpm, 0, sizeof(*bpm)); |
| | 479 | bpm->family = AF_BRIDGE; |
| | 480 | bpm->ifindex = dev->ifindex; |
| | 481 | nest = nla_nest_start_noflag(skb, MDBA_MDB); |
| | 482 | if (nest == NULL) |
| | 483 | goto cancel; |
| | 484 | nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); |
| | 485 | if (nest2 == NULL) |
| | 486 | goto end; |
| | 487 | |
| | 488 | if (__mdb_fill_info(skb, mp, pg)) |
| | 489 | goto end; |
| | 490 | |
| | 491 | nla_nest_end(skb, nest2); |
| | 492 | nla_nest_end(skb, nest); |
| | 493 | nlmsg_end(skb, nlh); |
| | 494 | return 0; |
| | 495 | |
| | 496 | end: |
| | 497 | nla_nest_end(skb, nest); |
| | 498 | cancel: |
| | 499 | nlmsg_cancel(skb, nlh); |
| | 500 | return -EMSGSIZE; |
| | 501 | } |
| | 502 | |
| | 503 | static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg) |
| | 504 | { |
| | 505 | size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) + |
| | 506 | nla_total_size(sizeof(struct br_mdb_entry)) + |
| | 507 | nla_total_size(sizeof(u32)); |
| | 508 | struct net_bridge_group_src *ent; |
| | 509 | size_t addr_size = 0; |
| | 510 | |
| | 511 | if (!pg) |
| | 512 | goto out; |
| | 513 | |
| | 514 | /* MDBA_MDB_EATTR_RTPROT */ |
| | 515 | nlmsg_size += nla_total_size(sizeof(u8)); |
| | 516 | |
| | 517 | switch (pg->key.addr.proto) { |
| | 518 | case htons(ETH_P_IP): |
| | 519 | /* MDBA_MDB_EATTR_SOURCE */ |
| | 520 | if (pg->key.addr.src.ip4) |
| | 521 | nlmsg_size += nla_total_size(sizeof(__be32)); |
| | 522 | if (pg->key.port->br->multicast_ctx.multicast_igmp_version == 2) |
| | 523 | goto out; |
| | 524 | addr_size = sizeof(__be32); |
| | 525 | break; |
| | 526 | #if IS_ENABLED(CONFIG_IPV6) |
| | 527 | case htons(ETH_P_IPV6): |
| | 528 | /* MDBA_MDB_EATTR_SOURCE */ |
| | 529 | if (!ipv6_addr_any(&pg->key.addr.src.ip6)) |
| | 530 | nlmsg_size += nla_total_size(sizeof(struct in6_addr)); |
| | 531 | if (pg->key.port->br->multicast_ctx.multicast_mld_version == 1) |
| | 532 | goto out; |
| | 533 | addr_size = sizeof(struct in6_addr); |
| | 534 | break; |
| | 535 | #endif |
| | 536 | } |
| | 537 | |
| | 538 | /* MDBA_MDB_EATTR_GROUP_MODE */ |
| | 539 | nlmsg_size += nla_total_size(sizeof(u8)); |
| | 540 | |
| | 541 | /* MDBA_MDB_EATTR_SRC_LIST nested attr */ |
| | 542 | if (!hlist_empty(&pg->src_list)) |
| | 543 | nlmsg_size += nla_total_size(0); |
| | 544 | |
| | 545 | hlist_for_each_entry(ent, &pg->src_list, node) { |
| | 546 | /* MDBA_MDB_SRCLIST_ENTRY nested attr + |
| | 547 | * MDBA_MDB_SRCATTR_ADDRESS + MDBA_MDB_SRCATTR_TIMER |
| | 548 | */ |
| | 549 | nlmsg_size += nla_total_size(0) + |
| | 550 | nla_total_size(addr_size) + |
| | 551 | nla_total_size(sizeof(u32)); |
| | 552 | } |
| | 553 | out: |
| | 554 | return nlmsg_size; |
| | 555 | } |
| | 556 | |
| | 557 | void br_mdb_notify(struct net_device *dev, |
| | 558 | struct net_bridge_mdb_entry *mp, |
| | 559 | struct net_bridge_port_group *pg, |
| | 560 | int type) |
| | 561 | { |
| | 562 | struct net *net = dev_net(dev); |
| | 563 | struct sk_buff *skb; |
| | 564 | int err = -ENOBUFS; |
| | 565 | |
| | 566 | br_switchdev_mdb_notify(dev, mp, pg, type); |
| | 567 | |
| | 568 | skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC); |
| | 569 | if (!skb) |
| | 570 | goto errout; |
| | 571 | |
| | 572 | err = nlmsg_populate_mdb_fill(skb, dev, mp, pg, type); |
| | 573 | if (err < 0) { |
| | 574 | kfree_skb(skb); |
| | 575 | goto errout; |
| | 576 | } |
| | 577 | |
| | 578 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); |
| | 579 | return; |
| | 580 | errout: |
| | 581 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); |
| | 582 | } |
| | 583 | |
| | 584 | static int nlmsg_populate_rtr_fill(struct sk_buff *skb, |
| | 585 | struct net_device *dev, |
| | 586 | int ifindex, u16 vid, u32 pid, |
| | 587 | u32 seq, int type, unsigned int flags) |
| | 588 | { |
| | 589 | struct nlattr *nest, *port_nest; |
| | 590 | struct br_port_msg *bpm; |
| | 591 | struct nlmsghdr *nlh; |
| | 592 | |
| | 593 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); |
| | 594 | if (!nlh) |
| | 595 | return -EMSGSIZE; |
| | 596 | |
| | 597 | bpm = nlmsg_data(nlh); |
| | 598 | memset(bpm, 0, sizeof(*bpm)); |
| | 599 | bpm->family = AF_BRIDGE; |
| | 600 | bpm->ifindex = dev->ifindex; |
| | 601 | nest = nla_nest_start_noflag(skb, MDBA_ROUTER); |
| | 602 | if (!nest) |
| | 603 | goto cancel; |
| | 604 | |
| | 605 | port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT); |
| | 606 | if (!port_nest) |
| | 607 | goto end; |
| | 608 | if (nla_put_nohdr(skb, sizeof(u32), &ifindex)) { |
| | 609 | nla_nest_cancel(skb, port_nest); |
| | 610 | goto end; |
| | 611 | } |
| | 612 | if (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid)) { |
| | 613 | nla_nest_cancel(skb, port_nest); |
| | 614 | goto end; |
| | 615 | } |
| | 616 | nla_nest_end(skb, port_nest); |
| | 617 | |
| | 618 | nla_nest_end(skb, nest); |
| | 619 | nlmsg_end(skb, nlh); |
| | 620 | return 0; |
| | 621 | |
| | 622 | end: |
| | 623 | nla_nest_end(skb, nest); |
| | 624 | cancel: |
| | 625 | nlmsg_cancel(skb, nlh); |
| | 626 | return -EMSGSIZE; |
| | 627 | } |
| | 628 | |
| | 629 | static inline size_t rtnl_rtr_nlmsg_size(void) |
| | 630 | { |
| | 631 | return NLMSG_ALIGN(sizeof(struct br_port_msg)) |
| | 632 | + nla_total_size(sizeof(__u32)) |
| | 633 | + nla_total_size(sizeof(u16)); |
| | 634 | } |
| | 635 | |
| | 636 | void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx, |
| | 637 | int type) |
| | 638 | { |
| | 639 | struct net *net = dev_net(dev); |
| | 640 | struct sk_buff *skb; |
| | 641 | int err = -ENOBUFS; |
| | 642 | int ifindex; |
| | 643 | u16 vid; |
| | 644 | |
| | 645 | ifindex = pmctx ? pmctx->port->dev->ifindex : 0; |
| | 646 | vid = pmctx && br_multicast_port_ctx_is_vlan(pmctx) ? pmctx->vlan->vid : |
| | 647 | 0; |
| | 648 | skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC); |
| | 649 | if (!skb) |
| | 650 | goto errout; |
| | 651 | |
| | 652 | err = nlmsg_populate_rtr_fill(skb, dev, ifindex, vid, 0, 0, type, |
| | 653 | NTF_SELF); |
| | 654 | if (err < 0) { |
| | 655 | kfree_skb(skb); |
| | 656 | goto errout; |
| | 657 | } |
| | 658 | |
| | 659 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); |
| | 660 | return; |
| | 661 | |
| | 662 | errout: |
| | 663 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); |
| | 664 | } |
| | 665 | |
| | 666 | static bool is_valid_mdb_entry(struct br_mdb_entry *entry, |
| | 667 | struct netlink_ext_ack *extack) |
| | 668 | { |
| | 669 | if (entry->ifindex == 0) { |
| | 670 | NL_SET_ERR_MSG_MOD(extack, "Zero entry ifindex is not allowed"); |
| | 671 | return false; |
| | 672 | } |
| | 673 | |
| | 674 | if (entry->addr.proto == htons(ETH_P_IP)) { |
| | 675 | if (!ipv4_is_multicast(entry->addr.u.ip4)) { |
| | 676 | NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is not multicast"); |
| | 677 | return false; |
| | 678 | } |
| | 679 | if (ipv4_is_local_multicast(entry->addr.u.ip4)) { |
| | 680 | NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is local multicast"); |
| | 681 | return false; |
| | 682 | } |
| | 683 | #if IS_ENABLED(CONFIG_IPV6) |
| | 684 | } else if (entry->addr.proto == htons(ETH_P_IPV6)) { |
| | 685 | if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) { |
| | 686 | NL_SET_ERR_MSG_MOD(extack, "IPv6 entry group address is link-local all nodes"); |
| | 687 | return false; |
| | 688 | } |
| | 689 | #endif |
| | 690 | } else if (entry->addr.proto == 0) { |
| | 691 | /* L2 mdb */ |
| | 692 | if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) { |
| | 693 | NL_SET_ERR_MSG_MOD(extack, "L2 entry group is not multicast"); |
| | 694 | return false; |
| | 695 | } |
| | 696 | } else { |
| | 697 | NL_SET_ERR_MSG_MOD(extack, "Unknown entry protocol"); |
| | 698 | return false; |
| | 699 | } |
| | 700 | |
| | 701 | if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) { |
| | 702 | NL_SET_ERR_MSG_MOD(extack, "Unknown entry state"); |
| | 703 | return false; |
| | 704 | } |
| | 705 | if (entry->vid >= VLAN_VID_MASK) { |
| | 706 | NL_SET_ERR_MSG_MOD(extack, "Invalid entry VLAN id"); |
| | 707 | return false; |
| | 708 | } |
| | 709 | |
| | 710 | return true; |
| | 711 | } |
| | 712 | |
| | 713 | static bool is_valid_mdb_source(struct nlattr *attr, __be16 proto, |
| | 714 | struct netlink_ext_ack *extack) |
| | 715 | { |
| | 716 | switch (proto) { |
| | 717 | case htons(ETH_P_IP): |
| | 718 | if (nla_len(attr) != sizeof(struct in_addr)) { |
| | 719 | NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length"); |
| | 720 | return false; |
| | 721 | } |
| | 722 | if (ipv4_is_multicast(nla_get_in_addr(attr))) { |
| | 723 | NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed"); |
| | 724 | return false; |
| | 725 | } |
| | 726 | break; |
| | 727 | #if IS_ENABLED(CONFIG_IPV6) |
| | 728 | case htons(ETH_P_IPV6): { |
| | 729 | struct in6_addr src; |
| | 730 | |
| | 731 | if (nla_len(attr) != sizeof(struct in6_addr)) { |
| | 732 | NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length"); |
| | 733 | return false; |
| | 734 | } |
| | 735 | src = nla_get_in6_addr(attr); |
| | 736 | if (ipv6_addr_is_multicast(&src)) { |
| | 737 | NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed"); |
| | 738 | return false; |
| | 739 | } |
| | 740 | break; |
| | 741 | } |
| | 742 | #endif |
| | 743 | default: |
| | 744 | NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address"); |
| | 745 | return false; |
| | 746 | } |
| | 747 | |
| | 748 | return true; |
| | 749 | } |
| | 750 | |
| | 751 | static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = { |
| | 752 | [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY, |
| | 753 | sizeof(struct in_addr), |
| | 754 | sizeof(struct in6_addr)), |
| | 755 | }; |
| | 756 | |
| | 757 | static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, |
| | 758 | struct net_device **pdev, struct br_mdb_entry **pentry, |
| | 759 | struct nlattr **mdb_attrs, struct netlink_ext_ack *extack) |
| | 760 | { |
| | 761 | struct net *net = sock_net(skb->sk); |
| | 762 | struct br_mdb_entry *entry; |
| | 763 | struct br_port_msg *bpm; |
| | 764 | struct nlattr *tb[MDBA_SET_ENTRY_MAX+1]; |
| | 765 | struct net_device *dev; |
| | 766 | int err; |
| | 767 | |
| | 768 | err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, |
| | 769 | MDBA_SET_ENTRY_MAX, NULL, NULL); |
| | 770 | if (err < 0) |
| | 771 | return err; |
| | 772 | |
| | 773 | bpm = nlmsg_data(nlh); |
| | 774 | if (bpm->ifindex == 0) { |
| | 775 | NL_SET_ERR_MSG_MOD(extack, "Invalid bridge ifindex"); |
| | 776 | return -EINVAL; |
| | 777 | } |
| | 778 | |
| | 779 | dev = __dev_get_by_index(net, bpm->ifindex); |
| | 780 | if (dev == NULL) { |
| | 781 | NL_SET_ERR_MSG_MOD(extack, "Bridge device doesn't exist"); |
| | 782 | return -ENODEV; |
| | 783 | } |
| | 784 | |
| | 785 | if (!netif_is_bridge_master(dev)) { |
| | 786 | NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge"); |
| | 787 | return -EOPNOTSUPP; |
| | 788 | } |
| | 789 | |
| | 790 | *pdev = dev; |
| | 791 | |
| | 792 | if (!tb[MDBA_SET_ENTRY]) { |
| | 793 | NL_SET_ERR_MSG_MOD(extack, "Missing MDBA_SET_ENTRY attribute"); |
| | 794 | return -EINVAL; |
| | 795 | } |
| | 796 | if (nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { |
| | 797 | NL_SET_ERR_MSG_MOD(extack, "Invalid MDBA_SET_ENTRY attribute length"); |
| | 798 | return -EINVAL; |
| | 799 | } |
| | 800 | |
| | 801 | entry = nla_data(tb[MDBA_SET_ENTRY]); |
| | 802 | if (!is_valid_mdb_entry(entry, extack)) |
| | 803 | return -EINVAL; |
| | 804 | *pentry = entry; |
| | 805 | |
| | 806 | if (tb[MDBA_SET_ENTRY_ATTRS]) { |
| | 807 | err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX, |
| | 808 | tb[MDBA_SET_ENTRY_ATTRS], |
| | 809 | br_mdbe_attrs_pol, extack); |
| | 810 | if (err) |
| | 811 | return err; |
| | 812 | if (mdb_attrs[MDBE_ATTR_SOURCE] && |
| | 813 | !is_valid_mdb_source(mdb_attrs[MDBE_ATTR_SOURCE], |
| | 814 | entry->addr.proto, extack)) |
| | 815 | return -EINVAL; |
| | 816 | } else { |
| | 817 | memset(mdb_attrs, 0, |
| | 818 | sizeof(struct nlattr *) * (MDBE_ATTR_MAX + 1)); |
| | 819 | } |
| | 820 | |
| | 821 | return 0; |
| | 822 | } |
| | 823 | |
| | 824 | static struct net_bridge_mcast * |
| | 825 | __br_mdb_choose_context(struct net_bridge *br, |
| | 826 | const struct br_mdb_entry *entry, |
| | 827 | struct netlink_ext_ack *extack) |
| | 828 | { |
| | 829 | struct net_bridge_mcast *brmctx = NULL; |
| | 830 | struct net_bridge_vlan *v; |
| | 831 | |
| | 832 | if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) { |
| | 833 | brmctx = &br->multicast_ctx; |
| | 834 | goto out; |
| | 835 | } |
| | 836 | |
| | 837 | if (!entry->vid) { |
| | 838 | NL_SET_ERR_MSG_MOD(extack, "Cannot add an entry without a vlan when vlan snooping is enabled"); |
| | 839 | goto out; |
| | 840 | } |
| | 841 | |
| | 842 | v = br_vlan_find(br_vlan_group(br), entry->vid); |
| | 843 | if (!v) { |
| | 844 | NL_SET_ERR_MSG_MOD(extack, "Vlan is not configured"); |
| | 845 | goto out; |
| | 846 | } |
| | 847 | if (br_multicast_ctx_vlan_global_disabled(&v->br_mcast_ctx)) { |
| | 848 | NL_SET_ERR_MSG_MOD(extack, "Vlan's multicast processing is disabled"); |
| | 849 | goto out; |
| | 850 | } |
| | 851 | brmctx = &v->br_mcast_ctx; |
| | 852 | out: |
| | 853 | return brmctx; |
| | 854 | } |
| | 855 | |
| | 856 | static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, |
| | 857 | struct br_mdb_entry *entry, |
| | 858 | struct nlattr **mdb_attrs, |
| | 859 | struct netlink_ext_ack *extack) |
| | 860 | { |
| | 861 | struct net_bridge_mdb_entry *mp, *star_mp; |
| | 862 | struct net_bridge_port_group __rcu **pp; |
| | 863 | struct net_bridge_port_group *p; |
| | 864 | struct net_bridge_mcast *brmctx; |
| | 865 | struct br_ip group, star_group; |
| | 866 | unsigned long now = jiffies; |
| | 867 | unsigned char flags = 0; |
| | 868 | u8 filter_mode; |
| | 869 | int err; |
| | 870 | |
| | 871 | __mdb_entry_to_br_ip(entry, &group, mdb_attrs); |
| | 872 | |
| | 873 | brmctx = __br_mdb_choose_context(br, entry, extack); |
| | 874 | if (!brmctx) |
| | 875 | return -EINVAL; |
| | 876 | |
| | 877 | /* host join errors which can happen before creating the group */ |
| | 878 | if (!port && !br_group_is_l2(&group)) { |
| | 879 | /* don't allow any flags for host-joined IP groups */ |
| | 880 | if (entry->state) { |
| | 881 | NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups"); |
| | 882 | return -EINVAL; |
| | 883 | } |
| | 884 | if (!br_multicast_is_star_g(&group)) { |
| | 885 | NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined"); |
| | 886 | return -EINVAL; |
| | 887 | } |
| | 888 | } |
| | 889 | |
| | 890 | if (br_group_is_l2(&group) && entry->state != MDB_PERMANENT) { |
| | 891 | NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed"); |
| | 892 | return -EINVAL; |
| | 893 | } |
| | 894 | |
| | 895 | mp = br_mdb_ip_get(br, &group); |
| | 896 | if (!mp) { |
| | 897 | mp = br_multicast_new_group(br, &group); |
| | 898 | err = PTR_ERR_OR_ZERO(mp); |
| | 899 | if (err) |
| | 900 | return err; |
| | 901 | } |
| | 902 | |
| | 903 | /* host join */ |
| | 904 | if (!port) { |
| | 905 | if (mp->host_joined) { |
| | 906 | NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host"); |
| | 907 | return -EEXIST; |
| | 908 | } |
| | 909 | |
| | 910 | br_multicast_host_join(brmctx, mp, false); |
| | 911 | br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB); |
| | 912 | |
| | 913 | return 0; |
| | 914 | } |
| | 915 | |
| | 916 | for (pp = &mp->ports; |
| | 917 | (p = mlock_dereference(*pp, br)) != NULL; |
| | 918 | pp = &p->next) { |
| | 919 | if (p->key.port == port) { |
| | 920 | NL_SET_ERR_MSG_MOD(extack, "Group is already joined by port"); |
| | 921 | return -EEXIST; |
| | 922 | } |
| | 923 | if ((unsigned long)p->key.port < (unsigned long)port) |
| | 924 | break; |
| | 925 | } |
| | 926 | |
| | 927 | filter_mode = br_multicast_is_star_g(&group) ? MCAST_EXCLUDE : |
| | 928 | MCAST_INCLUDE; |
| | 929 | |
| | 930 | if (entry->state == MDB_PERMANENT) |
| | 931 | flags |= MDB_PG_FLAGS_PERMANENT; |
| | 932 | |
| | 933 | p = br_multicast_new_port_group(port, &group, *pp, flags, NULL, |
| | 934 | filter_mode, RTPROT_STATIC); |
| | 935 | if (unlikely(!p)) { |
| | 936 | NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new port group"); |
| | 937 | return -ENOMEM; |
| | 938 | } |
| | 939 | rcu_assign_pointer(*pp, p); |
| | 940 | if (entry->state == MDB_TEMPORARY) |
| | 941 | mod_timer(&p->timer, |
| | 942 | now + brmctx->multicast_membership_interval); |
| | 943 | br_mdb_notify(br->dev, mp, p, RTM_NEWMDB); |
| | 944 | /* if we are adding a new EXCLUDE port group (*,G) it needs to be also |
| | 945 | * added to all S,G entries for proper replication, if we are adding |
| | 946 | * a new INCLUDE port (S,G) then all of *,G EXCLUDE ports need to be |
| | 947 | * added to it for proper replication |
| | 948 | */ |
| | 949 | if (br_multicast_should_handle_mode(brmctx, group.proto)) { |
| | 950 | switch (filter_mode) { |
| | 951 | case MCAST_EXCLUDE: |
| | 952 | br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE); |
| | 953 | break; |
| | 954 | case MCAST_INCLUDE: |
| | 955 | star_group = p->key.addr; |
| | 956 | memset(&star_group.src, 0, sizeof(star_group.src)); |
| | 957 | star_mp = br_mdb_ip_get(br, &star_group); |
| | 958 | if (star_mp) |
| | 959 | br_multicast_sg_add_exclude_ports(star_mp, p); |
| | 960 | break; |
| | 961 | } |
| | 962 | } |
| | 963 | |
| | 964 | return 0; |
| | 965 | } |
| | 966 | |
| | 967 | static int __br_mdb_add(struct net *net, struct net_bridge *br, |
| | 968 | struct net_bridge_port *p, |
| | 969 | struct br_mdb_entry *entry, |
| | 970 | struct nlattr **mdb_attrs, |
| | 971 | struct netlink_ext_ack *extack) |
| | 972 | { |
| | 973 | int ret; |
| | 974 | |
| | 975 | spin_lock_bh(&br->multicast_lock); |
| | 976 | ret = br_mdb_add_group(br, p, entry, mdb_attrs, extack); |
| | 977 | spin_unlock_bh(&br->multicast_lock); |
| | 978 | |
| | 979 | return ret; |
| | 980 | } |
| | 981 | |
| | 982 | static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
| | 983 | struct netlink_ext_ack *extack) |
| | 984 | { |
| | 985 | struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1]; |
| | 986 | struct net *net = sock_net(skb->sk); |
| | 987 | struct net_bridge_vlan_group *vg; |
| | 988 | struct net_bridge_port *p = NULL; |
| | 989 | struct net_device *dev, *pdev; |
| | 990 | struct br_mdb_entry *entry; |
| | 991 | struct net_bridge_vlan *v; |
| | 992 | struct net_bridge *br; |
| | 993 | int err; |
| | 994 | |
| | 995 | err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack); |
| | 996 | if (err < 0) |
| | 997 | return err; |
| | 998 | |
| | 999 | br = netdev_priv(dev); |
| | 1000 | |
| | 1001 | if (!netif_running(br->dev)) { |
| | 1002 | NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running"); |
| | 1003 | return -EINVAL; |
| | 1004 | } |
| | 1005 | |
| | 1006 | if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) { |
| | 1007 | NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled"); |
| | 1008 | return -EINVAL; |
| | 1009 | } |
| | 1010 | |
| | 1011 | if (entry->ifindex != br->dev->ifindex) { |
| | 1012 | pdev = __dev_get_by_index(net, entry->ifindex); |
| | 1013 | if (!pdev) { |
| | 1014 | NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist"); |
| | 1015 | return -ENODEV; |
| | 1016 | } |
| | 1017 | |
| | 1018 | p = br_port_get_rtnl(pdev); |
| | 1019 | if (!p) { |
| | 1020 | NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port"); |
| | 1021 | return -EINVAL; |
| | 1022 | } |
| | 1023 | |
| | 1024 | if (p->br != br) { |
| | 1025 | NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); |
| | 1026 | return -EINVAL; |
| | 1027 | } |
| | 1028 | if (p->state == BR_STATE_DISABLED) { |
| | 1029 | NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state"); |
| | 1030 | return -EINVAL; |
| | 1031 | } |
| | 1032 | vg = nbp_vlan_group(p); |
| | 1033 | } else { |
| | 1034 | vg = br_vlan_group(br); |
| | 1035 | } |
| | 1036 | |
| | 1037 | /* If vlan filtering is enabled and VLAN is not specified |
| | 1038 | * install mdb entry on all vlans configured on the port. |
| | 1039 | */ |
| | 1040 | if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { |
| | 1041 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
| | 1042 | entry->vid = v->vid; |
| | 1043 | err = __br_mdb_add(net, br, p, entry, mdb_attrs, extack); |
| | 1044 | if (err) |
| | 1045 | break; |
| | 1046 | } |
| | 1047 | } else { |
| | 1048 | err = __br_mdb_add(net, br, p, entry, mdb_attrs, extack); |
| | 1049 | } |
| | 1050 | |
| | 1051 | return err; |
| | 1052 | } |
| | 1053 | |
| | 1054 | static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry, |
| | 1055 | struct nlattr **mdb_attrs) |
| | 1056 | { |
| | 1057 | struct net_bridge_mdb_entry *mp; |
| | 1058 | struct net_bridge_port_group *p; |
| | 1059 | struct net_bridge_port_group __rcu **pp; |
| | 1060 | struct br_ip ip; |
| | 1061 | int err = -EINVAL; |
| | 1062 | |
| | 1063 | if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
| | 1064 | return -EINVAL; |
| | 1065 | |
| | 1066 | __mdb_entry_to_br_ip(entry, &ip, mdb_attrs); |
| | 1067 | |
| | 1068 | spin_lock_bh(&br->multicast_lock); |
| | 1069 | mp = br_mdb_ip_get(br, &ip); |
| | 1070 | if (!mp) |
| | 1071 | goto unlock; |
| | 1072 | |
| | 1073 | /* host leave */ |
| | 1074 | if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) { |
| | 1075 | br_multicast_host_leave(mp, false); |
| | 1076 | err = 0; |
| | 1077 | br_mdb_notify(br->dev, mp, NULL, RTM_DELMDB); |
| | 1078 | if (!mp->ports && netif_running(br->dev)) |
| | 1079 | mod_timer(&mp->timer, jiffies); |
| | 1080 | goto unlock; |
| | 1081 | } |
| | 1082 | |
| | 1083 | for (pp = &mp->ports; |
| | 1084 | (p = mlock_dereference(*pp, br)) != NULL; |
| | 1085 | pp = &p->next) { |
| | 1086 | if (!p->key.port || p->key.port->dev->ifindex != entry->ifindex) |
| | 1087 | continue; |
| | 1088 | |
| | 1089 | if (p->key.port->state == BR_STATE_DISABLED) |
| | 1090 | goto unlock; |
| | 1091 | |
| | 1092 | br_multicast_del_pg(mp, p, pp); |
| | 1093 | err = 0; |
| | 1094 | break; |
| | 1095 | } |
| | 1096 | |
| | 1097 | unlock: |
| | 1098 | spin_unlock_bh(&br->multicast_lock); |
| | 1099 | return err; |
| | 1100 | } |
| | 1101 | |
| | 1102 | static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, |
| | 1103 | struct netlink_ext_ack *extack) |
| | 1104 | { |
| | 1105 | struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1]; |
| | 1106 | struct net *net = sock_net(skb->sk); |
| | 1107 | struct net_bridge_vlan_group *vg; |
| | 1108 | struct net_bridge_port *p = NULL; |
| | 1109 | struct net_device *dev, *pdev; |
| | 1110 | struct br_mdb_entry *entry; |
| | 1111 | struct net_bridge_vlan *v; |
| | 1112 | struct net_bridge *br; |
| | 1113 | int err; |
| | 1114 | |
| | 1115 | err = br_mdb_parse(skb, nlh, &dev, &entry, mdb_attrs, extack); |
| | 1116 | if (err < 0) |
| | 1117 | return err; |
| | 1118 | |
| | 1119 | br = netdev_priv(dev); |
| | 1120 | |
| | 1121 | if (entry->ifindex != br->dev->ifindex) { |
| | 1122 | pdev = __dev_get_by_index(net, entry->ifindex); |
| | 1123 | if (!pdev) |
| | 1124 | return -ENODEV; |
| | 1125 | |
| | 1126 | p = br_port_get_rtnl(pdev); |
| | 1127 | if (!p || p->br != br || p->state == BR_STATE_DISABLED) |
| | 1128 | return -EINVAL; |
| | 1129 | vg = nbp_vlan_group(p); |
| | 1130 | } else { |
| | 1131 | vg = br_vlan_group(br); |
| | 1132 | } |
| | 1133 | |
| | 1134 | /* If vlan filtering is enabled and VLAN is not specified |
| | 1135 | * delete mdb entry on all vlans configured on the port. |
| | 1136 | */ |
| | 1137 | if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { |
| | 1138 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
| | 1139 | entry->vid = v->vid; |
| | 1140 | err = __br_mdb_del(br, entry, mdb_attrs); |
| | 1141 | } |
| | 1142 | } else { |
| | 1143 | err = __br_mdb_del(br, entry, mdb_attrs); |
| | 1144 | } |
| | 1145 | |
| | 1146 | return err; |
| | 1147 | } |
| | 1148 | |
| | 1149 | void br_mdb_init(void) |
| | 1150 | { |
| | 1151 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0); |
| | 1152 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0); |
| | 1153 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0); |
| | 1154 | } |
| | 1155 | |
| | 1156 | void br_mdb_uninit(void) |
| | 1157 | { |
| | 1158 | rtnl_unregister(PF_BRIDGE, RTM_GETMDB); |
| | 1159 | rtnl_unregister(PF_BRIDGE, RTM_NEWMDB); |
| | 1160 | rtnl_unregister(PF_BRIDGE, RTM_DELMDB); |
| | 1161 | } |
projects / linux-2.6-block.git / blame_incremental